Train-speed-control device



March 9 1926.

1,575,748 c. c. FARMER TRAIN SPEED CONTROL DEVICE Filed June 5, 1924INVENTOR GLYDE O. FARMER ATTORN Patented Mar. 9, 1926.

UNITED STATES PATENT OFOFICE.

CLYDE C. FARMER, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO THE WESTINGHOUSE AIR BRAKE COMPANY, OE VILMERDING, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

TRAIN-SPEED-CONTROL DEVICE.

Application led June 5,

T 0 all whom t may concern:

Be it known that I, CLYDn C. FARMER, a citizen of the United States,residing vat Pittsburgh, in the county of Allegheny and State .oiPennsylvania, have invented new train, the operation of each valvebeing.

adapted to limit the speed of the train to a speed dependent upon theparticular valve which is operated, a speed control equip mont of theabove character being shown in the prior application of T. I-I. Thomas,Serial No. 531,67 6, tiled January 25, v1922.

lVhere a locomotive is operated in both passenger and freight service,it is necessary that the speed control apparatus b e provided with meanswherebyv the train 1s controlled according to one range of speed limitswhen operatingin passenger service and according to another and lowerrange ot speed limits when the train is operating in freight service. l

The principal object ot my invention is to provide improved means foraccomplishing the above purpose in which the same governor controlledvalves are employed both tor passenger and for freight service.

In the accompanying drawing; Fig. 1 is a central. sectional view of acentrifugal governor speed control 4unit embodying my invention; Fig. 2aface view of the governor Voperated cross-head; Fig. 3 a view of themanually controlled adjustingl portion of the construction shown in Fig.1, showing same when moved to its operating position;

' Fig. 4 a section on the line, 4-4 of Fig. 2;

Fig. 5 an end view of the manually controlled adjusting portion; andFig. 6 a section on the line 6-6 of Fig. 1.

The centrifugal governor portion of the train speed control apparatusmay comprisel l al casing 1; `containiirg a speed governor, a

1924. Serial No. 717,982.

cross-head 2 adapted to be operated by said governor and a plurality ofvalves adapted to be operated according to the movement of: thecross-head 2.

The speed governor may comprise pivoted governor arms 3, alongitudinally movable spindle 4l operatively connected to cross-head 2,and a collar 5, carried by said spindle and adapted to be engaged andmoved by the governor arms 3, in accordance with the speed of thegovernor.

The movement of cross-head 2 is adapted to`` operate any number of seed.l control valves, but for the purpose of i lustration, I

have shown a high speed valve 6, a medium speed valve 7 and blow downtiming valves S and 9.

According to my invention, on the crosshead 2 is mounted a laterallymovable slide 10. At an intermediate point, the slide 10 is providedwitha rack bar 11, the teeth of which are adapted to mesh with the teethof a gear segment 12.

The gear segment 12 is carried by an operating member 13, which isrotatably mounted in the cross-head 2. In order to lock the member 13 ineither one or". its operation positions, a locking device is providedcomprising a longitudinally movable pin 14 having a squared portionwhich is mounted in the member 13, so that the lock- V'ing device willturn with said member. At-

tached to pin .1A-iis a cross-bar 15 adapted to engage in either one oftwo recesses at right angles to each other and formed lugs 16 on thecross-head 2. A spring A,17 tends to maintain said cross-bar in its'locking position in one of the recesses.

In, axial alinement with theV pin 14C is a manually operable devicecomprising a plunger 18 having a squared portlon which 1s mounted toslide in a rotatable sleeve and valve vmember 19. A crossbar 2O issecured to one end vof the plunger 18, and the other end is providedwith a manually operable engage an .extended recess 26 inthe Casing :L,L i; A y 1...( 'per loo when the knob is depressed and the pin hasentered the recess by way rof slot 2.7.

he lross-bar 2() normally engages in slots 2H ,n'ovided in bushing 29and the plunger l is normally maintained in its nen-operating` positionby sprin` 2:30.

when the plunger 18 is moved toward the left of the position shown inFig'. 1. 'the cross-bar 20 is adapted to Aengage slots 3l in the member123 for the purpose of rotating' same. l

'I he sleeve y1 9 acts as a valve to connect one set of ports controlledby the timing valves S and 9 so that these. valves operate as desiredfor freight lservice, whenthe sleeve 19 is in one position, and toconnect another of ports in another' position when the valvesare tooperate in passenger service, Thus eaeh timing' valve o} )erates both in,freight and passenger sem/ice and a separate. valve yfor eaeh classofserviee is not required.

Mounted in the slide valve. 1() vare 'tappets 3 2, 2323, Bel, and 35eachadapted. to eny,gage the stems of the respective valve 6,

S, il), and 7, and the tappets 32 and 35 are provided with two faces atdifferent levels, so that when the slide 10 is shifted laterally, thestems of the correspoiiding valves will be in alinement with faces atthe other level.A

The stems of the tappets are screwthreaded to Areceive disks 36, 37 3S,and 39, said disks having their peripheries notched, so that the disksmay be turned by the .euat'ement'of a screw driver or rod with the Ynotches.

By rotating the disks, the tappets may be adjusted relatively to thevalve stems, so that the tappets will engage the valve stems at thedesired speed of the speed governor.

In order to guide and maintain the crosshead in the properlalinement,said crosshead may beprovided with pins or guide rods Ll() adapted toengage in grooves of rollers 41 which are pivotally mounted on thecasing 1. i

In Fig. 1, the speed governor unit is `shown positioned or 4adjustedlfor freight service. If it is desired to set same for passengerservice,y the operator unscrews `and removes the cap 4.2. so as toexpose the knob 2l. .He then depresses the'knob so that the pinQB enters.the recess 24; vand the pin Q'Q-passes through the slot 2T. Thismovement Causes the plunger 18 tobe .moved to the left so thatthecross-bar 20 engages the slots'll of thenlembers 1B.'

The operatorthen rotates the knob 21 in a clockwise direction, so thatthe pin 25 travels in the recess 26 andthe sleeve 19 is rotated and withthe sleeve the plunger 1S and cross-bar The cross-bar vQO being .inengagement tn litlie ljthe' infenber 13 is rotated and thereby the rackbar 1l, so that the slide 1() is shifted laterally to cause the lowerfaces of the tappets 32 and 255 to aline with the.correspondin;r valvestems. Il'vhenthe speed governor is operatiupy with the cross-head slide1t) l:uljusted to the above described position, it will be. evident thathigher governor speeds are nesessary before Vthe tappets will engage thevalve stems to open the valves. Then 'the sleeve 19 is rotated as abovedescribed, the set of ports of the timing valves S and 9 for freightservice are eut out of service while the set of ports for passengerservice are cut in.

The ports are held in their adjusted positions for passeneer service bythe engagement of the pin 2o in the recess 2G but when it is desired toagain adjust the speed Iorernor u nit for freight service, the knob Qiis .rotated in a counter cloekwise direc*A fr, so that the member 115 isrotated and the slide 1() is moved back to the freight position. asshown in Fie'. 1.

lVhen in this position, the knob 21 may be released, when the spring 30will shift the plunger 18 to the position shown in Fig'. l.

Having now described my invention, what I claim as new and desire'tosecure by Iletters Patent, is

1. In a train control apparatus, the combination with a speed governoroperated according to the speed of the train, of a plurality of valves,actuating means associated `with said governor for operating' saidvalves,

and means for adjusting said actuating means to operate said valves atdifferent train speeds. i

2. I na train control apparatus, the combination with a speed governoroperated according tothe speed of thetrain, of a valve, a cross-headoperable by said governor, a slide mounted'in said cross-head, a tappetvcarried by said cross-head and provided with faces at different levelsfor engaging' said valve, and means for adjusting,` said slide to bring'different faces of said tappetinto operating alinelnent with said valve.

In a train control apparatus, the Conibination with a speed governoroperated aeeording to t-he speed of the train, of a plurality of valves,a cross-head operated by said'governor, a slide mounted in saidcrosshead, tappets carried by said slide and provided. with faces atdiiif'erent levels for engaging said valves, and means for adjustingsaid `slide to bring different faces of said tappets into operatingalinement with said valves. i i

4. In a train control apparatus, the combination-with a speed governoroperated ac# eording' to the speed of the train, of la valve. s srhead'associated with said governor', a

a tappet mounted on said member for operating said valve, mechanism foradjusting said member, and a manually operable device movable. to aposition for actuating said mechanism.

5. In a train control apparatus, the combination with a speed governoroperated according to the speed of the train, of a valve, a cross-headassociated with said governor, a slide carried b y said cross-head, atappet mounted on said slide for operating said valve, mechanismincluding a slotted member for operating said slide, a plunger havingmeans for engaging said slotted member, a spring tending to hold saidplunger in its non-operating position, and means for locking saidplunger in its operating position in engagement with said member. n

(5. .In a train control apparatus, the combination with a speed governoroperated according to the speed of the train, of a valve adjustablemeans operated by said governor for operating said valve, a plungerhaving means for operatively engaging said adjustable means, a rotatablesleeve in which said plunger is mounted, and a manuallyT operated memberassociated with said plunger and movable to engage and rotate saidsleeve and thereby said plunger.

7. In a train control apparatus, the Combination -ivith a speed governoroperated according to the speed oi the train, ot' speed control valves,means controlled by said governor 'for actuating said valves and amanually` operated valve means having one position for establishing afluid pressure communication to one valve for one class of serv-k iceand another position for establishing a diti'erent fluid pressurecommunication for another class of service.

8. In a train control apparatus, the combination with a speed governoroperated acc cording to the speed of the train, of a valve operated bothin high speed passenger and low speed freight service for controllingthe speed of the train, means operated by said governor for operatingsaid valve, and man- Y ual means for causing said valve to operateeither as required for passenger service or as required for freightservice.

In testimony whereof I have hereunto set my hand.

oLYDE o. FARMER.

